The Validate command aims to ensure that Flyway can reliably create the requested version of a database from a chain of migration scripts and then that nothing is retrospectively added, removed or altered that would prevent it from reproducing that version. Validation errors are Flyway's warning that "the source for this version has changed". Read more
The Clean command resets a database to its initial state, before any Flyway migrations were applied. In other words, it empties the database. This can be useful for any development task that requires that you recreate the database structure, or for tearing down a test harness. It also allows you to try out experiments and alternative strategies within an isolated feature branch, and then reverse out of them. Read more
A Flyway Baseline migration script is a single script with a B prefix that will migrate an empty database, or one that Flyway has 'cleaned', to the version specified in the file name. It is useful both for consolidating a long, often complex chain of historical migrations, and for capturing the current production version of a database, as the starting point for developing subsequent migrations. Read more
The Baseline command is intended to make it easy to turn any preexisting production database into a Flyway database so that, subsequently, versioned migrations can then be applied to it, bringing greater stability and predictability to database deployments. Read more